Secondary-clock movement.



A. L. HAHL. SECONDARY CLOCK MOVEMENT. APPLICATION FILED OCT. 29. 1912.

Patented July 9, 1918.. 3 SHEETS-SHEET I.

mi? f 4a m: NORR.'S PETERS ca. Fnom-ufmz. wnsuuvaruu. n. c.

A. L. HAHL. SECONDARY CLOCK MOVEMENT. APPLICATION man ocnze. I912.

Patented J111y9, 1918.- 3 SHEETS-SHEET 2 Ill-l2: 2::

i P a g 457 Liza 2/ ATTORNEY wrrsns ca. PNom-uma. WASHINGTON. n, c.

Patented July 9, 1918. 3 SHEETS-SHEET 3 L H A H L Am SECONDARY CLOCKMOVEMENT. APPLICATION FILED OCT F y a w lg @mfzzsfik/ZZ 4f 64/ W iATTORNEY I AUGUSTUS L. HAHL, OF CHICAGO, ILLINOIS.

Specification of Letters Patent.

SECONDARY-CLOCK MOVEMENT.

Patented July 9, 1918.

Application filed October 29, 1912. Serial No. 728,339.

To all whom it may concern:

Be it known that I, AUGUSTUS L. HAHL, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Secondary-ClockMovements, of which the following is a specificat on.

My invention relates to secondary clock mechanism which is intended foruse in time systems in which a master clock controls said secondaryclocks by an air conduit or other connecting means leading from saidmaster clock to said secondary clocks.

Among the principal objects of my invention are to provide a protectedactuating diaphragm in the secondary clock; to provide means forpreventing stretching, and consequent stiflening, of said diaphragm, andother means by which all damage to the diaphragm is prevented; toprovide a planger plate which is actuated by said diaphragm withoutbeing attached thereto, and which is freely guided and linked to thediaphragm casing; to provide convenient devices whereby the diaphragmmay be quickly removed and renewed without the necessity of reachinginto the mechanism; to provide means for positive adjustment of theplunger plate with relation to the clock mechanism without thepossibility of accidental shifting; to provide an escapement mechanismin which both actuating pawls have in herent equal movements to insureuniform margin of movement with minimum movement of the diaphragm; toinsure accurate positioning of the hands; and other features which willbe rendered apparent in the following specification, when taken inconnection with the accompanying drawings, in which Figure 1 is a frontelevation, partly in section, of my improved secondary clock mechanismon an enlarged scale.

Fig. 2 is a horizontal section thereof, taken on the line 22 of Fig. 1.

Fig. 3 is a side elevation of the clock mechanism.

Fig. 4 is a detail plan view of one of the levers, showing itsconnections with the diaa phragnn Fig. 5 is a perspective view of awedge device which opens the connecting link.

Fig. 6 is a perspective view of the connecting link.

Fig. 7 is a perspective view of the pawlcarrying link.

Fig. 7 a is a perspective view of a fragment of the link shown in Fig. 7

Fig. 8 is a perspective view of the flexible adJusting arm for theconnecting link.

Fig. 9 is a perspective view of a portion of the lower lever; and

Fig. 10 is a sectional view of said lever, taken on the line 1010 ofFig. 1.

Referring more particularly to Fig. 1, it will be seen that I employ aflexible diaphragm 15 for-receiving the air pressure from the conduitleading from the master clock, and that I impart the motion to the clockmechanism by means of the link 16. This link is provided with suitabledevices at its ends for receiving the pressure of the diaphragm and alsofor imparting said movement to the clock mechanism, all of which will bemore fully described below.

The link 16 imparts its movement to the lever 17 which, in turn, impartsthe movement to the pawl carrier 18, which in general occupies avertical position in the mechanism. The lever 17 is pivotally mounted inthe frame. The pawls 19 and 20 thus car ried actuate a toothed wheel 22,commonly called an escapement wheel. The upper end of the pawl carrier18 is pivotally connected with the lever 21, which is mounted in themain frame in a similar manner to the lever 17.

This toothed wheel is fixed to a shaft 28, rotatably mounted in theframe. This shaft through the usual transmission gearing 23 carries andmoves the hour and minute hands. The pawl carrier 18 is provided with ahorizontally extending arm 29, to which is pivotally attached the pawl19 by means of a pin 30. This pawl is provided with a weighted end 31,which maintains the upper end of said pawl in engagement with the teethof the wheel. Said pawl is also provided with a lug or heel 31, whichprevents the upper end of said pawl. engaging the teeth too deeply. a Y

The pawl arrier 18 is also provided with an arm 32, which carries theother pawl 20 in operative relation to the wheel 22 on the opposite sideto that of the pawl 19. The pawlQO isgpivotallyattached to said arm 32by means of a'p'in' The weighted end 34 of said pawl causes the lowerend thereof to maintain engagement with thewheel 22', and the outer end34: of the arm 3 2 se ri es as a stop for said pawl to prevent too deepengagement.

T-h'e lever 17 is provided with a wedgeshaped end produced by ,theconverging faces 36 and 37, which enters the spaces bewee he t eth an seve a a ro i lqm meansfor'said teethat theend of each .upward strokeofthe lever. vertical face 36 adjoining the face 86, servesas a pos tivestop for the teeth the wheel, thereby properly limiting the motionthereof.

h le e 21 is prev ded t a sim l wedge-shaped end 35*, the outer face 36"in this case serving as stop. The lever 17' is pivotally mounted in ,thenain frame by means of the pin or ag le 38,and is provided with acounterbalancing a1gn1'39. Theleyer 21 is provided with a similar pin orandeii and. counterbalancing arm 39 The link 16 is connected withthelever 17 byj -indirect means for the purposes of ad justment, whichconsists of a flexible arm 40, riveted, as at 41,1or integral with saidletter. At the other ,end ,ofthislfiexible arm is an eye 42, throughwhicha pin may be inserted, said pinjalso passing through holes inytheupper end-of the-link 16. A thumb screw 4:3, carried by a lug 44 on saidlever, provides a convenient means for adjusting the precise p'ositionof the arm 40 with re spect to the body of the lever 17. By this meansthe relation between the diaphragm and the lever 17 may be veryconveniently adjusted."

The link 16 comprises two side members 415 and 46, which are preferablyintegrally connected at their upper ends, thereby gforming an elasticdevice which may be very conveniently sprunginto connection with thepart which isactuated by the diaphragm. The lower end of this link isprovided with inwardly turned ends 47 and 18, in which circular notchesare cut, and which thereby form means for engaging the neck 51' of saidpart. The socket-thus formed in the lower end of the link for engagingthe neck is shown at49. Inclined faces 50 and 50 leadingto said socketserve to guide the link into operative connection with said neck whenthe link is being sprung into place. A tongue 60,2bent inwardly.prevents the link being pressed too far by engaging with the head 52immediately above said neck.

The wedging device 54 is placed between the sidemembers 4.5 and a6 andis pivotally mounted at 57 upon the same previously mentioned which isinserted in the eye 42 of the arm 10. This wedging device is providedwith two outwardly projecting wedges 55 and 56, which press the sidewalls of the link 16 outwardly when said device is pushed between them.This action causes the two halves of the socket 49 to becomes'ufii'ciently disengaged from the neck 51 to permit the 16 to be swungout of connection therewith. A lug 59 prevents the wedging device beingswung too far away from thelink, into a position which cannot berweadily reached by the operator.

The head 52 is integrally connected by the neck 51 with thehub 53, towhich .acircular Plu ge p a is n en r qal y a tac e This p a i adapt fil elee e y .upqn th upper ,su:rface o;f the diaphragm and vill be ac uatd t ereby vitt l ei s-p si irs y connected therewith by fasteningdevices or the n Th di ph a m 15 s th re y retained in its integral andundamaged condition. Betweensaid plate and the diaphram 15 1 preferablyinsert a circular sheet of flexible material 66 for ,the purpose .ofpreventing adhesion ofthe diaphragm to the plate. The grooves ordepressions 67 53 in the inner faces of the diaphragm case prevententireexclusionof the and therefore prevent adhesion ofthe surfaces.

The hub 53 is guided in a vertical .direction and held in a concentricposition by the radial :links 61, 62 and ,63, which are pivota ly at aeed t0 the l r raem ca i 69 at-their outer ends and to the hub 53 attheir'inner ends. The main body .68 of the diaphragm casing is given adished .or .concave form to snugly fit .the diaphragm when the latter isin its lowermost position. The outer edges of the casing are turnedupwardly, asshown at 69, to closely confine the outer edge of thediaphragm and to re.- ceive the upper portion 67 ;of the casing. Thisupper portion is preferably a thin plate, circular in form, with a largeaperture in the center. The upper portion 67 is held imposition in closecontact with the outer edge portion of the diaphragm by spring clips 71,which engage the main body of the casing at one end'and ,the uppersurface of the upper portion 67 at the otherend. These spring clipspress the upper portion 67 snugly into position upon the diaphragm, andthereby lock it in position without causing any injurious rubbing orother distortion thereof.

The hollow plug 72 is riveted in an aperture in the diaphragm casing.This plug is threaded at its lower end to screw into the socket 7 6fastened to the frame 75 A large disk 74, projecting slightly beyond-theouter circumference of the casing and provided with lugs 7 1 providesconvenient means for manipulating the entire diaphragm structure, whenit is desired to re will spread the sides of the link move the casingand renew the diaphragm. The plug 72 is provided with a polygonalportion 7 3 to which the disk 74 is fitted. It will be seen that byturning the disk 74 the casing can be disengaged from the frame.

The diaphragm may be removed from the casing by first removing thespring clips 71. The upper portion 67 of the casing may then be removed.Previously to this, it is necessary to disconnect the link 16 from theneck 51, thereby permitting the diaphragm plate to be lifted. The outerends of the links 61, 62 and 63 may be disconnected from the casing at64.

As shown in Fig. 1, the plunger plate 65 has a diameter slightly greaterthan the aperture 7 O in the upper casing portion 67 This upper portionthereby serves as a stop for the upward movement of the plunger plate.In order to permit the insertion of the plate through said upperportion, I provide notches 67 and 67, which have a radius slightlygreater than that of the aperture. The plunger plate may be passedthrough these notches in a slightly inclined position, after which it ismoved into a concentric position, one side being finally disposed belowthe lug 67.

In operation, it will be clearly seen that an impulse of air in theconduit leading to the sockets 72 will cause the diaphragm to be pressedupwardly and that said diaphragm will thereby impart a pressure to theplunger plate 65. The links 61, 62 and 63 will guide said plate in avertical direction and maintain its concentric position, and by means ofthe hub 53 and the inwardly turned ends 47 and 48 of the link 16 saidpressure will be transmitted to said link. This link, by means of thepin 42 and the arm 40, will transmit the upward motion to the lever 17,which, in turn, will impart the upward motion to the pawl carrier 18. Bymeans of the pawl 19 a rotary movement will be imparted to the toothedwheel..

lVhen the pressure in the conduit has been removed, the weight of themovable parts of the mechanism will cause a downward move ment of thediaphragm and the plate 65. The pawl carrier 18 will move downwardly andthe pawl 20 will engage the teeth of the wheel and cause a furtherrotary movement thereof. The wedge-shaped ends 35 and, 35 will enter thespaces between the teeth 1 and finally cause a precise positioning ofthe wheel 22 and thereby an accurate positioning of the clock hands. Anytendency of the clock hands to move beyond their normal position, due totheir momentum, will be corrected by said wedge-shaped ends.

The operator may very conveniently disconnect the link 16 from theplunger plate by simply pushing the wedging device to the right, whenthe small wed es 55 and 56 15, after which said link may be swung to oneside and out of the way.

It will be seen that I have provided a very convenient and compactdiaphragm structure which may be packed and shipped without an any waydamaging it and which may be inserted in or removed from the clockmechanism with the utmost facility. It will be seen that all assemblingwork on the diaphragm structure may be done in the factory, therebysaving outside work. The

adjustment of the stroke may also be effected with great precision andwith the utmost convenience, without risk of accidental change ofadjustment.

lVhile I have described more or less precisely the details ofconstruction, I do notwish to be understood as limiting myself thereto,as I contemplate changes in form and the proportions of parts and thesubstitution of equivalents as circumstances may suggest or renderexpedient without departing from the spirit of my invention.

I claim:

1. In a secondary clock movement, an escapement wheel, pawls disposed insubstantially diametrically opposite operative relation to said wheel, asingle pawl carrier having relatively immovable fulcrums thereon forsaid pawls arranged to impart equal motions to said pawls upon movementof said pawl carrier, said pawls being arranged to act alternately indriving said wheel.

2. In a secondary clock movement, an escapement wheel, pawls disposed inoperative relation to said wheel, a single pawl carrier havingrelatively immovable fulcrums for said pawls arranged to impart equalmotions to said pawls upon movement of said pawl carrier, said pawlsbeing arranged to drive said wheel alternately and positioning stops forsaid wheel, said stops being independent of said pawls.

3. In a secondary clock movement, an escapementwheel, a pawl disposed inoperative relation to said wheel, a pawl carrier adapted upon movementthereof to actuate said pawl to drive said wheel, a motor, a linkoperatively connected to said pawl carrier and detachably connected tosaid motor, and means cooperating with said link for detaching the samefrom said motor.

4. In a secondary clock movement, an escapement wheel. a pawl disposedin operative relation to said wheel, a pawl carrier adapted uponmovement thereof to actuate said pawl to drive said wheel, a motor, alink operatively connected to said pawl carrier and detachably connectedto said motor. and means permanently associated with said link fordetaching the same from said motor.

In a secondary clock movement. an escapement wheel, a motor, pawlsdisposed in operative relation to said wheel, a bodily movable pawlcarrier connected with and tuated by said motor, andrmeans comprising aflexible member for adjustinglsaid carrier with ..relation "to ;saidmotor.

6. In arsecondary clock m ovement,.an,escapement wheel, a motor, pawlsactuated by said-.motorapawl carrier, and a link con necting saidmotorand carrier composed of flexible armshaving ends. adapted to. engage the.movablelpart of said motor.

17. In a secondary.clockmovement, an escapement wheel, a motor,,pawlseactuatedjby saidmotor, apawl carrier, a link connectmg saidanotor and carrier composed of flexible arms hav ng endsadaptedtorengage the movable part of said motor, and means associated withsaidlink for 'detachingsaid 9. In a secondary clock movement, an escapementwheel, pawls disposed in operativerelation to said wheel, a diaphragmoperatively connected with said pawls,anopen' casing for said diaphragm,a movable plate for receiving motion from said diaphragm, and means toseparate said plate and said diaphragm, said movable plate cooperatingwith a portion of said casing 'to limit the expansion of said diaphragmto prevent stretching thereof.

10. In a secondaryclocl; movement, an escapement wheel, a pawl disposedin operative relation tosaid wheel, a diaphragm, an open casing for saiddiaphragm, a movable plate for receiving motion from said diaphragm,means for imparting said motion to said pawl, and guide memberspivotally connected to said casing and operatively connected to saidmovable plate for guiding the movement of the latter.

11. In a secondary clock movement, an es capement wheel, pawls disposedin operative relation to said wheel, a diaphragm, an open casing forsaid diaphragm, a movable plate for receiving motion from saiddiaphragm, and means for imparting said motion to said pawls, saidmovable plate cooperating with a portion of said casing to limit theexpansion of said diaphragm to prevent stretching thereof, said movableplate being removably confined within said casing and removabletherefrom without dismantling said'casing.

12. In a secondary clock movement, an escapement wheel, pawls disposedin operative relation to said'wheel, a single inflexible pawl carrierforrbothsaid pawls, a pivoted mounted .lever pivoted to said pawlcarrier to guideithe same and a movable member associated with saidlever for imparting movement thereto.

13. .In a secondary vtimemovement, a single sheet diaphragm, meansactuated by said diaphragm,a movable member :unattached'tosaid diaphragmfor receiving mo: tion therefrom, and means detachably' swiveled. tosaid movable member and .pivotally connected to said first named means.

.14, In a secondarytime movement, a single sheet diaphragm, meansactuated by said diaphragnna casing for said diaphragm,- resilientomeansforholding'the peripheral portion oftsaid diaphragm in air tightengagement withsaidrcasing and-means for transmitting motion from saiddiaphragm to said first named means.

l5.- 1n a secondary clock movement, an escapement wheel, ,a pair ofpawls disposed in operative relation to said wheel, a single pawlcarrier having relatively immovable fu'ler-ums thereon for said pawls,pivoted links connected -to said pawl carrier for guiding the samelinmotion of translation, and means for imparting said motion to said pawlcarrier, said parts being arranged to giveequal movement to said pawlsupon movement of said pawl carrier.

l6.1In a secondary clock movement, an escapement wheel, a pair of pawlsdisposed in operative relation to said wheel, a single pawl carrierhaving relatively immovable fulcrums thereon for said pawls, pivotedlinks connected "to .said pawl carrier for guiding the same in motion oftranslation, positioning lugs ,for said escapement wheel carried bv saidpivoted links, and means for imparting said motion to said pawl carrier,said parts being arranged to give equal movement to said parts uponmovement of said pawl carrier.

17. In a secondary clock movement, an escapement wheel, a pair of pawlsdisposed in operative relation to said wheel, a single pawl carrierhaving relatively immovable fulcrums thereon for said pawl, pivotedlevers connected to said pawl carrier, said levers being weighted at theends thereof opposite said pawl carrier, a motor, and means forconnecting said motor to one of said levers whereby the operation ofsaid motor will operate to reciprocate said pawl carrier and impartequal motions to said pawls.

18. In a secondary clock movement, an escapement wheel, a pair of pawlsdisposed in operative relation to said wheel, a single pawl carrierhaving relatively immovable fulcrums thereon for said pawls, pivotedlevers connected to said pawl carrier, said levers being weighted at theends thereof opposite said pawl carrier, a motor, and means forconnecting said motor to one of said levers whereby the operation ofsaid motor Will. operate to reciprocate said pawl carrier and impartequal motions to said pawls, said connecting means being adjustablyconnected to said lever for regulating the movement of said pawlcarrier.

19. In a secondary clock movement, an escapement wheel, pawls disposedin operative relation to said wheel, a single pawl carrier for both ofsaid pawls, and means for imparting a parallelogram movement to saidcarrier, whereby equal movements are imparted to said pawls.

20. In a secondary clock movement, an escapement wheel, pawls disposedin operative relation to said wheel, a single pawl carrier for both ofsaid pawls, means for imparting a parallelogram-movement to saidcarrier, whereby equal movements are imparted to said pawls, andpositioning lugs Copies of this patent may be obtained for five centseach, by addressing; the Commissioner of Patents actuated with saidcarrier for engaging said escapement Wheel.

21. In a secondary clock movement, an escapement wheel, a pawl disposedin operative relation to said wheel, a single sheet diaphragm, a movablemember of lesser area than said diaphragm for receiving motiontherefrom, said member being unat tached to said diaphragm, means fortransmitting said motion from said movable member to said pawl, and linkmembers relatively fixed at one end and operatively connected to saidmovable member at their other ends for guiding the latter in a straightline.

In testimony whereof I have subscribed my name.

AUGUSTUS L. HAHL.

IVitnesses:

AXNA L. IVALTON, E. M. Ammasora Washington, D. G.

